{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\toprule
                &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                &\multicolumn{1}{c}{\shortstack{GDPPC\\Max Area}}&\multicolumn{1}{c}{\shortstack{GDPPC\\Max Area}}&\multicolumn{1}{c}{\shortstack{GDPPC\\Average}}&\multicolumn{1}{c}{\shortstack{GDPPC\\Weighted}}\\
\midrule
Mean State Duration (Using Turnovers)&    0.441\sym{***}&                  &                  &                  \\
                &  (0.138)         &                  &                  &                  \\
Mean State Duration Sq (Using Turnovers)&   -0.469\sym{***}&                  &                  &                  \\
                &  (0.127)         &                  &                  &                  \\
Mean State Duration (Using Disc Turnovers)&                  &    0.215\sym{***}&                  &                  \\
                &                  &  (0.064)         &                  &                  \\
Mean State Duration Sq (Using Disc Turnovers)&                  &   -0.110\sym{***}&                  &                  \\
                &                  &  (0.026)         &                  &                  \\
Mean State Duration&                  &                  &    0.957\sym{***}&    0.948\sym{***}\\
                &                  &                  &  (0.173)         &  (0.167)         \\
Mean State Duration (Sq)&                  &                  &   -1.464\sym{***}&   -1.450\sym{***}\\
                &                  &                  &  (0.208)         &  (0.201)         \\
Agricultural Suitability &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Elevation       &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Distance to Water &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Agri Adoption   &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Distance to City &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Latitude        &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Longitude       &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Lat*Lon         &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
Country FE in Yr2000 &$\checkmark$         &$\checkmark$         &$\checkmark$         &$\checkmark$         \\
\midrule
Observations    &     2223         &     2223         &     2223         &     2223         \\
\bottomrule
\end{tabular}
}
